diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 32638e6bfc540ccc5f762c13148d8e13666e016a..066453e2148d97b5e5ed67711f580543a2a87469 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -2830,11 +2830,13 @@ AC_DEFUN([GLIBCXX_ENABLE_CSTDIO], [
       CSTDIO_H=config/io/c_io_stdio.h
       BASIC_FILE_H=config/io/basic_file_stdio.h
       BASIC_FILE_CC=config/io/basic_file_stdio.cc
-      AC_MSG_RESULT(stdio)
 
       if test "x$enable_cstdio" = "xstdio_pure" ; then
+	AC_MSG_RESULT([stdio (without POSIX read/write)])
 	AC_DEFINE(_GLIBCXX_USE_STDIO_PURE, 1,
 		  [Define to restrict std::__basic_file<> to stdio APIs.])
+      else
+	AC_MSG_RESULT([stdio (with POSIX read/write)])
       fi
       ;;
   esac
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index de6eb1c60020322ef0b5f6af35751ea622128ace..ed64b5599c89aeca4d3c139366154ce7bc3aada4 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -16408,13 +16408,16 @@ fi
       CSTDIO_H=config/io/c_io_stdio.h
       BASIC_FILE_H=config/io/basic_file_stdio.h
       BASIC_FILE_CC=config/io/basic_file_stdio.cc
-      { $as_echo "$as_me:${as_lineno-$LINENO}: result: stdio" >&5
-$as_echo "stdio" >&6; }
 
       if test "x$enable_cstdio" = "xstdio_pure" ; then
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: stdio (without POSIX read/write)" >&5
+$as_echo "stdio (without POSIX read/write)" >&6; }
 
 $as_echo "#define _GLIBCXX_USE_STDIO_PURE 1" >>confdefs.h
 
+      else
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: stdio (with POSIX read/write)" >&5
+$as_echo "stdio (with POSIX read/write)" >&6; }
       fi
       ;;
   esac